MLX90109 データシートの表示（PDF） - Melexis Microelectronic Systems

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MLX90109

125kHz RFID Transceiver

Melexis Microelectronic Systems  

MLX90109

125kHz RFID Transceiver

9. Typical configuration: READ ONLY

9.1. Application diagram

The MLX90109 is a highly integrated reader IC. In the application schematic below, only two resistors to set VMODU are

required, next to the antenna inductance and tune capacitor. Capacitors C1 and CD can be added for a better noise

cancellation.

VDD

VDD

Microcontroller

CD=100nF

L, C

1

8

C1

2

7 DATA

3

6 CLOCK

4

5 MODE

SPEED

9.2. Absolute minimum schematic

The interface with the microcontroller can be realized with only one connection. In this case, the mode pin is left floating

and the integrated decoding is not used.

VDD

VDD

Microcontroller

CD=100nF

L, C

1

8

C1

2

7 DATA

SPEED

3

6 CLOCK

4

5 MODE

9.3. Power consumption

If the power consumption is not critical and the reader does not have to be put in power down, the MODU voltage can be

strapped to the required level (between 0.8V and Vpd). However, the power consumption can be reduced by controlling the

voltage on VMODU pin (e.g. with an IO port of a microcontroller).

REVISION 011 - JUNE 19, 2017

3901090109

Page 11 of 17

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